Integration of Defocus by Dual Power Fresnel Lenses Inhibits Myopia in the Mammalian Eye

Integration of Defocus by Dual Power Fresnel Lenses Inhibits Myopia in the Mammalian Eye.Invest Ophthalmol Vis Sci. 2014 Jan 7McFadden SA, Tse DY, Bowrey HE, Leotta AJ, Lam CS, Wildsoet CF, To CH.

This study found that in guinea pigs, myopia can be induced and then reduced by using plus lenses and dual focus fresnel lenses.  In this study, like in many other animal studies, this reduction of myopia through the use of plus lenses seems to be fairly effective, but it's on induced myopia, so it might not be as effective in human myopia, which is not induced.  The question that remains for me is, what are the triggers that begin the process of developing myopia?  Since there appears to be a very strong genetic component to human myopia, and many have proposed that genetic predispositions are triggered by environmental factors, what are the triggers?  And in the cases where these genetic predispositions exist, can environmental changes (like more sunlight as is suggested in many studies, or plus lenses, for example) be as effective as in the cases of induced myopia?

Link: http://www.ncbi.nlm.nih.gov/pubmed/24398103